Also don't place glasses over the tines,the tines interfere with water flow. dishes with narrow openings, like baby bottles, don't allow for good wash and rinse action. If a dish in a certain spot almost always attracts grit put a different shaped dish in that spot. Always use a high quilty detergent, some cheap stuff dosen't always dissolve good. Don't store your detergent under the sink(like most people do) -too humid,can destroy the active ingredients (in granular detergent). Measure water hardness, to determine proper amount of detergent to use(usually 1 TEASPOON for every grain of water hardness) Somewhere in Samurai's links and this stuff lies your answer.